If you believe in physics and are not too anal regarding your audio setup, you could be fine. Here are the variables: there will be a timing delay but I challenge whether it would be audible in a perfect world. It is measurable but you are talking nanoseconds here. Also in a perfect world, you would be able to extrapolate that measured difference and move the speaker with the longer cable a millimeter or two closer to your listening position, mitigating the measured delay. Now with all of this used as a disclaimer, the mere fact that you are asking this question means that you will always be wondering whether you have a mismatch, which will drive you crazy. Either you recognize that there will be a measurable but "mechanically" insignificant delay or you recognize that it will likely not materially matter. But if you recognize that it will likely not "materially" matter than you will also then double guess the need for Valhallas....your ATC speakers are not wired with Valhalla's from the electronic crossover to the individual amps in each speaker and oh, by the way, have you opened up your speakers to check the lengths of the wire used inside them to make sure they are the same length?
The above text, while scientifically accurate simply highlights how obsessive we can become. Relax, if you want the cables, buy them. You will be unable to hear any timing differences and whether you hear other differences....well...I don't want to start any wars. Good luck.
The above text, while scientifically accurate simply highlights how obsessive we can become. Relax, if you want the cables, buy them. You will be unable to hear any timing differences and whether you hear other differences....well...I don't want to start any wars. Good luck.